Mitsubishi Galant (2004+). Manual - part 768

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-211

STEP 2. Measure the voltage at blower motor connector 
C-115. 

(1) Disconnect blower motor connector C-115, and measure 

the voltage at the wiring harness side.

(2) Disconnect A/C-ECU connector C-15 and ground harness 

side terminal No.9.

(3) Turn the ignition switch to the "ON" position.

(4) Measure the voltage between terminal 1 and ground.

• The measured value should be approx. 12 volts (battery 

positive voltage).

Q: Is the measured voltage approx. 12 volts?

YES :  Go to Step 11.
NO :   Go to Step 3.

STEP 3. Check blower relay connector C-202 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

Q: Is blower relay connector C-202 in good condition?

YES : Go to Step 4.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

.The 

blower motor should operate normally.

AC305233BN

CONNECTOR: C-115

HARNESS SIDE

AC306911

AC306911AB

CONNECTOR C-15 
(HARNESS SIDE)

AC209365

CONNECTOR C-115 
(HARNESS SIDE)

GW

AC305415BC

CONNECTOR: C-202

JUNCTION BLOCK SIDE

JUNCTION BLOCK 
(FRONT VIEW)

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-212

STEP 4. Check the blower relay continuity.

Follow the table below to check the blower relay for continuity.

Q: Is the blower relay continuity in good condition?

YES : Go to Step 5.
NO :  Replace the blower relay. The blower motor should 

operate normally.

STEP 5. Measure the voltage at blower relay connector 
C-202. 

(1) Disconnect blower relay connector C-202, and measure the 

voltage at the junction block side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 1 and ground.

• The measured value should be approximately 12 volts 

(battery positive voltage).

Q: Is the measured voltage approx. 12 volts?

YES :  Go to Step 7.
NO :   Go to Step 6.

BATTERY 
VOLTAGE

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Not applied

4 

− 5

Open circuit

• Connect 

terminal 1 to the 
positive battery 
terminal

• Connect 

terminal 3 to the 
negative battery 
terminal

4 

− 5

Less than 2 ohms

AC306657

AB

4

5

1 2 3

5

1

4

3

BLOWER RELAY

AC305415BC

CONNECTOR: C-202

JUNCTION BLOCK SIDE

JUNCTION BLOCK 
(FRONT VIEW)

AC209365

CONNECTOR C-202 
(JUNCTION BLOCK SIDE)

GX

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-213

STEP 6. Check the wiring harness between blower relay 
connector C-202 (terminal 1) and the ignition switch (IG2).

NOTE: Also check junction block connector C-215 for loose, 
corroded, or damaged terminals, or terminals pushed back in 
the connector. If junction block connector C-215 is damaged, 
repair or replace the connector as described in GROUP 00E, 
Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between blower relay connector 

C-202 (terminal 1) and the ignition switch (IG2) in good 
condition?
YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

NO :  Repair the wiring harness. The blower motor should 

operate normally.

AC305416

CONNECTORS: C-202, C-215

JUNCTION BLOCK 
(FRONT VIEW)

C-215

HARNESS SIDE

C-215

JUNCTION BLOCK SIDE

C-202

C-202

AM

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-214

STEP 7. Measure the voltage at blower relay connector 
C-202. 

(1) Disconnect blower relay connector C-202, and measure the 

voltage at the junction block side.

(2) Measure the voltage between terminal 5 and ground.

• The measured value should be approximately 12 volts 

(battery positive voltage).

Q: Is the measured voltage approx. 12 volts?

YES :  Go to Step 9.
NO :   Go to Step 8.

AC305415BC

CONNECTOR: C-202

JUNCTION BLOCK SIDE

JUNCTION BLOCK 
(FRONT VIEW)

AC209365GY

CONNECTOR C-202 
(JUNCTION BLOCK SIDE)